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Cutting Tool Materials ( 공구 재질 )

Cutting Tool Materials ( 공구 재질 ). HSS ( 하이스 ) Carbide ( 초경 ) Cermet CBN Diamond. Cutting-Tool Materials. A cutting tool has the following characteristics: Hardness ( 경도 ) at high temperature ~ Speed Toughness ( 인성 ) ~ Feed & depth Wear resistance ( 내마모성 ) Chemical stability ( 화학적 안정성 ).

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Cutting Tool Materials ( 공구 재질 )

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  1. Cutting Tool Materials (공구재질) • HSS (하이스) • Carbide (초경) • Cermet • CBN • Diamond

  2. Cutting-Tool Materials • A cutting tool has the following characteristics: • Hardness (경도) at high temperature ~ Speed • Toughness (인성) ~ Feed & depth • Wear resistance (내마모성) • Chemical stability (화학적 안정성)

  3. HSS (하이스) HSS (High-speed steels) • HSS cuts faster than carbon tool steel, hence the name high speed steel, but slower than carbide tools. • It is often used in power saw blades and drill bits. TiN-Coated HSS • PVD (physical vapor deposition), TiN coating reduces tool wear. HSS Drill: http://www.youtube.com/watch?v=98DvSQNHLMU

  4. Carbides (초경) Carbides • Better wear resistance, stiffness, hot hardness • Tungsten carbide: WC + Co(for toughness)  powder metallurgy (sintered), suitable for non-ferrous, grey cast iron • Titanium carbide: TiC + Co : TiC is suitable for steel and cast iron Coated Carbide • Carbide + TiC, TiN, Al2O3 coated by CVD (chemical vapor deposition) • Chemically stable  greatly reduce crater wear

  5. Cermets Ceramics Aluminum oxide(Al2O3), Silicon-nitride(SiN), cold pressed and hot sintered Hot hardness ↑, toughness ↓ (chipping), thermal shock Cermets Ceramic(Al2O3) + metal binder(TiC) Hot hardness ↑, toughness ↓, thermal expansion ↑ Insert: less thermal stress, eliminate grinding by user, less setting time http://www.youtube.com/watch?v=Om9gzgNPf80

  6. Diamond, CBN Diamond (Poly crystal diamond) • Hardest material, Not good for steel CBN (polycrystalline cubic boron nitride) • 2nd hardest material, brittle, expensive http://www.youtube.com/watch?v=vAvfrrlMZg4 http://www.youtube.com/watch?v=mKxX50OMBd4&p=9B6D9EAE75875D9D

  7. Tool materials Tool materials, feeds, and cutting speeds • Characteristics of cutting-tool materials gives a range of cutting speeds and feeds for different applications. PCD CBN Speed (Hardness) Ceramic Cermet Coated carbide Carbide Coated HSS / HSS Feed (Toughness)

  8. Workpiece materials (소재 재질) • Workpiece materials and cutting speeds when Carbide tool or coated carbide tools is used for turning

  9. Cutting Tool Makers (공구제작사) • www.taegutec.co.kr • www.yg1.co.kr

  10. Cutting Fluids (절삭유) • Also called lubricants and coolants, cutting fluids. • Used extensively in machining operations to: • Cool the cutting zone • Reduce friction and wear • Reduce forces and energy consumption • Wash away chips • Protect surfaces from any environmental attack

  11. Sawing and saws (톱) • A cutting operation where the tool consists of a series of small teeth that removes material. Disk saw Belt saw

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